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Dyno results of a tuned P31 Package C63 AMG by OE Tuning, +30 whp

Warning: This dyno is a very low reading dyno. Most C63's with the P31 package dyno around 420whp stock on a dyno jet. Stock the car ranged from 378-394whp. Tuned it ranged from 417-427whp So that is a gain of 33whp and 32trq. Very solid numbers. I was not expecting these results at all as I have heard you could not gain much out of a tune on the P31. So thanks to Jeremy at OE Tuning!

The 1 funny thing is that I raced member Xtyper in a video you recently saw posted and when he was tuned and I was stock we were tied every time, was dead even. Xtpyer dyno'd at 420-422whp on the same dyno that I dyno'd at 390whp stock. So weird that we were tied racing but that I dyno'd 30whp less.

So to get some more real world results, we will have to get back out there and do some runs again! I also will be using the Vbox again, and try and beat my old time, which was pretty solid and I havent seen beaten by a tune only car yet.

Also to note. I took out my charcoal filters after and did some more runs and there was no gain. Did 3 runs and they all were in between my highest and lowest dyno. So I can say there was no dyno gains for me. Maybe at driving speeds it helps.

Great work DD GT3 RD and Jeremy (OE), congrats. Those are some very solid looking results and I was assuming the results would be much smaller. Still a little skeptical I guess.

There are still some anomalies and it will be nice to see these results backed up on VBox runs and maybe comparisons with other tuned C63s. Any plans for an independent dyno. Too late for base runs I suppose.

Thanks for taking the time, trouble and expense to record and post on these results. This is terrific information for the rest of us.

How are the seat of the pants results because that is where the fun is?

Great work DD GT3 RD and Jeremy (OE), congrats. Those are some very solid looking results and I was assuming the results would be much smaller. Still a little skeptical I guess.

There are still some anomalies and it will be nice to see these results backed up on VBox runs and maybe comparisons with other tuned C63s. Any plans for an independent dyno. Too late for base runs I suppose.

Thanks for taking the time, trouble and expense to record and post on these results. This is terrific information for the rest of us.

How are the seat of the pants results because that is where the fun is?

Im typically someone who doesnt go by seat of the pants feel. I always think my mind is playing tricks on me! lol...but on the drive home I did feel like the car was faster, but mostly felt torquier down low. I will be doing some vbox runs soon, well see if I beat my old time, which I havent seen beaten by any tune only car yet

Originally Posted by Even Money

Well, if u trust the dyno, then the other car u mentioned that was 420 whp is about the same as your tuned p31. So no surprises w the end result? Tune only cars should be about the same?

well, I think my car is making more torque down low if im not mistaken, but different days...but I will try and set up runs with the same car. Last time we were tied when he was tuned and I was stock.

Great work DD GT3 RD and Jeremy (OE), congrats. Those are some very solid looking results and I was assuming the results would be much smaller. Still a little skeptical I guess.

There are still some anomalies and it will be nice to see these results backed up on VBox runs and maybe comparisons with other tuned C63s. Any plans for an independent dyno. Too late for base runs I suppose.

Thanks for taking the time, trouble and expense to record and post on these results. This is terrific information for the rest of us.

How are the seat of the pants results because that is where the fun is?

He does have baselines, the second video is his baseline. Also, the baseline is shown on the graph.

Given the street-results mentioned above, one would expect the orange and blue runs to have very comparable peak output levels and areas under the curve. Yet, instead, the orange run shows significant gains - everywhere throughout the entire rpm range - over the aqua blue runs.

The dyno results also show a P31 is stronger than a stock C63, correct? And the videos show a P31 walking a stock C63, correct? So a tune on the C63 brings it dead even to the P31.

Also, dyno results were done on different days. This is the same dyno though so I do see your point. The real world results do not lie however as the dyno is primarily a tuning tool. This is why we all prefer 1/4 mile, vbox, and comparison runs.

When both cars run tuned we will have an understanding that is much more clear.

Yes, the tuned C63 makes more power than the stock P31, yet the P31 was even. I think this is what you are trying to get at, correct?

Correct. Something doesn't add up in this case IMHO. A +30 rwhp, +25 rwtq advantage, throughout the entire rpm range (so, a huge area-under-the-curve advantage) for the tuned non-P31, yet they run dead even on the street.

The dyno results also show a P31 is stronger than a stock C63, correct? And the videos show a P31 walking a stock C63, correct? So a tune on the C63 brings it dead even to the P31.

So, a delta of only +27 rwhp and +9 rwtq, results in the P31 walking the stock C63 by two car lengths. So far so good... as that makes sense. Yet when the C63 is tuned, it has a delta of +30 rwhp and +25 rwtq over the P31. But it can't walk the P31. At all. So that doesn't make sense.

Also, dyno results were done on different days. This is the same dyno though so I do see your point.

Day-to-day variability is less than ideal, but I'd suspect you wouldn't see swings in rwhp of 30+... are the posted results SAE?

This is why we all prefer 1/4 mile, vbox, and comparison runs.

Agreed!

Originally Posted by DD GT3 RD

^ yes, I agree. If I saw his tuned dyno and my stock dyno I would assume he would beat me easily. exactly why when I posted I wrote about it being funny, as in weird or strange.

Agree 100%.

But forget the dyno for a sec, I beat him by around 2 car lengths....after the tune was dead even so shows he must of gained good power.

Oh, I agree that his tuning gained him power - for sure. But if he had a 25 rwhp disadvantage and you could walk him, then he adds 55+ rwhp for a 30 rwhp advantage over you, he should have more than just caught up, and instead be able to walk you (i.e. your car is the variable that didn't change). But the real-world results didn't confirm/verify what the dyno results suggest.

Now the test will be when we run again to see what happens with both of us tuned. This will show what my car has gained.

Also agree. If you previously were even, and now you picked up 30+ rwhp and 30+ rwtq nearly everywhere... you should be back to walking xtyper's car by multiple car-lengths (I'd guess at least 3-4).

Correct. Something doesn't add up in this case IMHO. A +30 rwhp, +25 rwtq advantage, throughout the entire rpm range (so, a huge area-under-the-curve advantage) for the tuned non-P31, yet they run dead even on the street.

It is a bit puzzling, anything else in the P31 package that could account for it?

Originally Posted by c32AMG-DTM

So, a delta of only +27 rwhp and +9 rwtq, results in the P31 walking the stock C63 by two car lengths. So far so good... as that makes sense. Yet when the C63 is tuned, it has a delta of +30 rwhp and +25 rwtq over the P31. But it can't walk the P31. At all. So that doesn't make sense.

But the change in the real world shows a difference. Just not one that would show the tuned C63 as being stronger than the P31. I can't explain why the P31 seems to be more efficient. Compression is the same although the tune is more aggressive and the internals are stronger.

Originally Posted by c32AMG-DTM

Day-to-day variability is less than ideal, but I'd suspect you wouldn't see swings in rwhp of 30+... are the posted results SAE?

I would think they are corrected for conditions. Dyno dynamics throw me off so you need to ask the operator. I really prefer dynojets for these reasons.

Originally Posted by c32AMG-DTM

Oh, I agree that his tuning gained him power - for sure. But if he had a 25 rwhp disadvantage and you could walk him, then he adds 55+ rwhp for a 30 rwhp advantage over you, he should have more than just caught up, and instead be able to walk you (i.e. your car is the variable that didn't change). But the real-world results didn't confirm/verify what the dyno results suggest.

The only thing I can think of is that Sammy may be lighter, had less fuel, or that Sammy's motor is right having many less miles on it than xtyper.

For whatever reason, the P31 sure looks to be more efficient. Is the air intake different in any way?